Metal working – Method of mechanical manufacture – With testing or indicating
Patent
1980-04-07
1983-03-01
Combs, Ervin M.
Metal working
Method of mechanical manufacture
With testing or indicating
29240, 73761, 173 12, B23P 1906
Patent
active
043751237
ABSTRACT:
Apparatus and method for tightening assemblies held together by threaded fasteners. Prior to tightening, the gradients of a selected number of possible torque-rotation curves for the assembly are established and stored along with the associated tightening torques required to induce a desired preload in the fastener when the assembly is tightened according to the selected torque-rotation curves. As torque and rotation are imparted to the fastener to tighten the assembly, the gradient of the actual torque-rotation curve through which the assembly is taken is calculated. The calculated gradient is compared with the stored gradients to derive that tightening torque which is associated with that stored gradient closest in magnitude to the calculated gradient. The derived tightening torque is used to control the torque applied to the fastener.
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Combs Ervin M.
Nerenberg Aaron
SPS Technologies, Inc.
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